home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (ExecReqThread.java)

This example source code file (ExecReqThread.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

clientconnectionmanager, exception, execreqthread, getconnthread, httpcontext, httpparams, httpprocessor, httprequest, httprequestexecutor, httpresponse, httproute, override, requestspec, throwable

The ExecReqThread.java example source code

/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.impl.conn;

import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpProcessor;
import org.apache.http.protocol.HttpRequestExecutor;
import org.apache.http.util.EntityUtils;


/**
 * Executes a request from a new thread.
 * 
 */
public class ExecReqThread extends GetConnThread {

    protected final ClientConnectionManager conn_manager;
    protected final RequestSpec     request_spec;
    protected volatile HttpResponse response;
    protected volatile byte[]       response_data;


    /**
     * Executes a request.
     * This involves the following steps:
     * <ol>
     * <li>obtain a connection (see base class)
     * <li>open the connection
     * <li>prepare context and request
     * <li>execute request to obtain the response
     * <li>consume the response entity (if there is one)
     * <li>release the connection
     * </ol>
     */    
    public ExecReqThread(ClientConnectionManager mgr,
                         HttpRoute route, long timeout,
                         RequestSpec reqspec) {
        super(mgr, route, timeout);
        this.conn_manager = mgr;

        request_spec = reqspec;
    }

    
    public HttpResponse getResponse() {
        return response;
    }

    public byte[] getResponseData() {
        return response_data;
    }


    /**
     * This method is invoked when the thread is started.
     * It invokes the base class implementation.
     */
    @Override
    public void run() {
        super.run();    // obtain connection
        if (connection == null)
            return;     // problem obtaining connection

        try {
            request_spec.context.setAttribute
                (ExecutionContext.HTTP_CONNECTION, connection);

            doOpenConnection();

            HttpRequest request = (HttpRequest) request_spec.context.
                getAttribute(ExecutionContext.HTTP_REQUEST);
            request_spec.executor.preProcess
                (request, request_spec.processor, request_spec.context);

            response = request_spec.executor.execute
                (request, connection, request_spec.context);

            request_spec.executor.postProcess
                (response, request_spec.processor, request_spec.context);

            doConsumeResponse();

        } catch (Throwable dart) {
            dart.printStackTrace(System.out);
            if (exception != null)
                exception = dart;

        } finally {
            conn_manager.releaseConnection(connection, -1, null);
        }
    }


    /**
     * Opens the connection after it has been obtained.
     */
    protected void doOpenConnection() throws Exception {
        connection.open
            (conn_route, request_spec.context, request_spec.params);
    }

    /**
     * Reads the response entity, if there is one.
     */
    protected void doConsumeResponse() throws Exception {
        if (response.getEntity() != null)
            response_data = EntityUtils.toByteArray(response.getEntity());
    }


    /**
     * Helper class collecting request data.
     * The request and target are expected in the context.
     */
    public static class RequestSpec {
        public HttpRequestExecutor executor;
        public HttpProcessor processor;
        public HttpContext context;
        public HttpParams params;
    }

}

Other Java examples (source code examples)

Here is a short list of links related to this Java ExecReqThread.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.